Pet stairs



FIG. 1 is a front perspective view of pet stairs, showing our new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a rear view thereof;

FIG. 7 is a front view thereof; and,

FIG. 8 is a folded state view thereof.

The broken lines in the drawings illustrate the portions of the pet stairs, which form no part of the claimed design. 

CLAIM The ornamental design for pet stairs, as shown and described. 